Your new power amplifier is a state of the art, high performance, audiocomponent. It is built utilizing totally complementary circuitry from input tooutput. The high current power supply is driven by custom-designed torrodialtransformers (Model 7200 @ 2.0 KVA / Model 7125 @ 1.6 KVA / Model 7075 @800 VA) with two separate windings for each of the seven channels. The perchannel filter capacitance of the Model 7200 is 22,600 uF, while Model 7125measures 20,000 uF, and the Model 7075 comes in at 16,400 uF. All sevenchannels are each protected by an advanced Opto-coupled protection circuit.Heat management is provided by custom-designed heatsinks on each amplifiermodule, enabling the amplifier to function at full power without the needfor noisy fans.

Randy,

What is the point of trying to measure the output at this point? It seems to me it would be tough keeping the amp knowing its shortcomings.

_________________________
Rick

"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud

Well there is some news Yeah something is wrong, those amps are not what they are cracked up to be. It seems an ol boy over at AV123 did snip off the resistor you were talking about and the amp is still shutting down.........that sure as heck isn't good.

_________________________
Rick

"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud

Randy, I read through the whole thread and by the time I got to the end, I forgot half of what I read......

So, is or is not the EMO delivering it's claimed output without shutting down? That's the only question that really matters. If it only shuts down once you push past this point, than nothing is wrong. The protection circuit is doing what it's supposed to, and the guys at Emotiva have done their job. If it's not delivering the rated power, then they have more work to do.

If it is delivering the goods, and if you'll be pushing past this point on a regular basis, send it back - you need a bigger amp, man.

It would be nice if Ian or Alan would chime in on how the Sherwood amp performed during their torture tests with the 80's.

According to them it is, but they are not testing with 80's. I'm now starting to wonder, based on what I'm hearing elsewhere from others.

Based on my findings, I'm only using about 10 watts from 12ft away to achieve 100dB's, the amps are shutting down at 106-7dB's. Now I'm no expert like some of these other guys, but you can't tell me I'm using all 300 watts.

sirquak why don't you just ask them to send you the AP graphs for the THD and Power output. That will show exactly how much power it is producing. Any company worth its salt uses an AP for its testing so they should have the graphs.

So, is or is not the EMO delivering it's claimed output without shutting down? That's the only question that really matters. If it only shuts down once you push past this point, than nothing is wrong. The protection circuit is doing what it's supposed to, and the guys at Emotiva have done their job. If it's not delivering the rated power, then they have more work to do.

The point in contention is why these amps are shutting down. It does not matter one bit if they are putting out 50 WPC or 700 WPC. They are shutting down.

If they are putting out more power than advertised or what they are rated at, then Emo needs to integrate current limiting circuitry and not rely on over current protection as the current governing device.

Over current protection is a safety feature that should not ever come into play unless there is a short to ground somewhere on the load side, or if the amp is driving a load that it is not rated to drive. However, it is not driving a load it is not rated to drive, and there is no evidence to support a short to ground scenario (this is usually identified with cool lights, flashes and smoke).

Something is most definitely wrong. Specifically; the design.

Think of it this way.

Next time you get into your car, leave it in first gear and then pin the throttle down and see what happens (long straight away lacking of traffic and pedestrians please). Unless it’s an older vehicle with an older drive train that does not have a computer management system, it will reach red line RPM and the engine will not spin any higher or drive the car any faster. IT DOES NOT JUST SHUT DOWN. …….and neither should your amplifier.